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at 2025-04-07T23:54:40+02:00

Bug 1950056 - extend use of FOS_NODEREFERENCELINKS  r=Gijs,win-reviewers,gstoll

In the modern era of user-customizable Quick Access sidebars on every
file dialog, navigating via `.lnk` files is rather less useful than it
was twenty years ago.

Disable link-following in file-open dialogs by default, to prevent any
of the usual security issues involving symlink smuggling. Allow
overriding this behavior via a pref, for users who don't care.

(File-save dialogs have a more nuanced guard against that sort of thing;
this patch doesn't affect that.)

Differential Revision: https://phabricator.services.mozilla.com/D239833

@@ -16899,6 +16899,17 @@
    value: 0
    mirror: always
 +# Whether to follow `.lnk` (etc.) shortcuts in the Windows file-open dialog.
 +#
 +# Valid values:
 +#  * 0: never
 +#  * 1: always
 +#  * 2: auto
 +- name: widget.windows.follow_shortcuts_on_file_open
 +  type: RelaxedAtomicInt32
 +  value: 2
 +  mirror: always
++
  # The number of messages of each type to keep for display in
  # about:windows-messages
  - name: widget.windows.messages_to_log

@@ -614,19 +614,29 @@ nsFilePicker::ShowFilePicker(const nsString& aInitialDir) {
      // mode specific
      switch (mMode) {
 +      case modeOpenMultiple:
 +        fos |= FOS_ALLOWMULTISELECT;
 +        [[fallthrough]];
++
        case modeOpen:
          fos |= FOS_FILEMUSTEXIST;
 -        break;
+-
 -      case modeOpenMultiple:
 -        fos |= FOS_FILEMUSTEXIST | FOS_ALLOWMULTISELECT;
 +        switch (mozilla::StaticPrefs::
 +                    widget_windows_follow_shortcuts_on_file_open()) {
 +          case 1:
 +            break;
 +          default:
 +            fos |= FOS_NODEREFERENCELINKS;
 +        }
          break;
        case modeSave:
          fos |= FOS_NOREADONLYRETURN;
 -        // Don't follow shortcuts when saving a shortcut, this can be used
 -        // to trick users (bug 271732)
 -        if (IsDefaultPathLink()) fos |= FOS_NODEREFERENCELINKS;
 +        // Don't follow shortcuts when saving a shortcut; this can be used to
 +        // trick users (bug 271732). _Do_ follow shortcuts when not saving a
 +        // shortcut (bug 283730).
 +        if (IsDefaultPathLink()) {
 +          fos |= FOS_NODEREFERENCELINKS;
 +        }
          break;
        case modeGetFolder:

ma1 pushed to branch mullvad-browser-128.9.0esr-14.5-1 at The Tor Project / Applications / Mullvad Browser

Commits:

2 changed files:

Changes: